![]() Often better flow rates are achieved with slightly narrower channels and fewer bends or angles.Ī word of caution though if you enlarge the exhaust port fully to the size of the gasket when the manifold port opening is smaller than the gasket you will completely mess up the airflow. ![]() It is worth noting that enlarging the port size is not always beneficial and is only required in highly tuned engines where the port size has become a bottleneck. The air intake port would not benefit much by opening up to match the intake manifold, unless there is a step that obstructs the airflow into the engine. So most DIY port matching work is best performed on the exhaust ports. (The S2000 is a good example of this anomaly.) Generally speaking most standard non performance cars will benefit greatly from even a little DIY head porting.Ī high performance engine usually comes with a fairly optimum flow and these can only be improved by a specialist with a proper flow bench. Engines need to breathe as freely as possible and obstructions, seams and pits cause turbulence and this is not very good for airflow. Most internal surfaces are far from smooth due to the casting process so small gains are there to be had by smoothing out the rough edges although polishing the insides offers little if any extra gain. ![]() Generally the engine ports are larger in the upstream flow direction avoiding turbulance but power gains can be made by matching these up. This allows for scope in the manufacturing process to allow for mismatched alignment. The inlet and outlet ports on the engine block are usually larger than those of the manifolds that connect to them.
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